NB: the Java MessageFormat syntax is described in the MessageFormat Javadoc. There's in particular an important peculiarity for messages with parameters: single quotes need to be doubled to show up in the translated string, which is not the case for messages that are not parameterized.

Do the same for all the translations you want.

To enable multiple languages you'll need to go to the Administration page and set MultiLingual to true and list the different languages you wish to use in the Languages field.

Tell XWiki that your page is a Translation page by adding an Object of type TranslationDocumentClass to your page.

On the page where you want to use use either the {{translation}} macro or the Localization Script Service (check the document for the Localization module). Quick examples:

where key is the key for the message to retrieve. Parameters can also be passed as is shown in the second syntax above. Beware the parameters need to be passed as an array, not a plain String even if there's only one parameter: $services.localization.render("key", ["param1"]).

Old way

Prior to XWiki 4.3, the way to register a Document Resource Bundle was by going to the Administration page, selecting the "Localization" section and entering it in the "Internationalization Document Bundles" field. You could specify several pages, separated by commas.

When creating "Internationalization Document Bundles", you should avoid naming the pages with names that include spaces. For example, a document name of Main.My Messages could cause issues, instead, use Main.MyMessages

Alternatively you could also specify the list of Internationalization Document Bundles in xwiki.cfg under the key xwiki.documentBundles.

I18n of XWiki Objects

This is currently not implemented (see our logged issue: XWIKI-69). There are 2 workarounds you can use:

Have several objects, one for each language, with a language field, and then decide which object to use (for example in a Class Sheet, based on the current language):

$doc.getObject('Your.Class', 'lang', $context.language')## Will select the object whose 'lang' property is set to the current language

Use Velocity scripting to do an IF in your object. For example, you could have:

#if ($context.language == "fr") French texts#else Default texts#end

Using the static Resource Bundles

Stop your XWiki instance

Extract the ApplicationResources*.properties file for your language from the WEB-INF/lib/xwiki-*oldcore-*.jar file and put them in your WEB-INF/classes directory

Edit this file and add/modify the key/value pairs you need for your application

In your document, use the following to get the value associated with a key: $services.localization.render("key")

This will get the value from the Resource Bundle corresponding to the current language you are using in XWiki.

If you're writing an extension JAR and wish to have static translation resources, you can put them in a ApplicationResources*.properties file at the root of your extension JAR and they'll get picked up by the Localization module. See the Localization module for more details.